Features:    The Joyo JF-33 Analog Delay gives you  mild and mellow circuit delay effect.    3 adjustable knobs: Time: adjust delay times; Repeat: adjust delay repeat times; Mix: adjust the contrast proportion.     True bypass design to minimize the tone loss.     Heavy duty switch with all metal casing.     Specifications:    Model: JF-33    Color: Green    Material: Aluminum alloy    Delay time range: 600MS-3000MS (millisecond)    Input impedance: 1Mω    Output impedance: 1Kω    Running current: 40mA    Power: 6F22 9V battery / DC 9V adapter (Neither included)    Item size: 11.7 * 6.7 * 5.1cm / 4.6 * 2.6 * 2.0in    Item weight: 205g / 7.2oz    Package size: 13 * 7.5 * 6.2cm / 5.1 * 2.9 * 2.4in    Package weight: 245g / 8.6oz     Note:     This unit is without battery, put on the battery by opening the back cover with a screw driver.    Please use the 9V power adapter whose polarity is positive pole outside and negative pole inside.     Package Included:  1 * Joyo JF-33 Analog Delay  1 * User Manual